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x³ - 7x² + 19x - 13
The only possible zeros are the factors of 13, which are ±1 and ±13.
So we use synthetic division to try the easiest one first, 1:
1 | 1 -7 19 -13
| 1 -6 13
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1 -6 13 0
We're in luck because that left a 0 remainder.
So we have factored the polynomial as
(x - 1)(x² - 6x + 13)
It has zeros found by setting each of those factors = 0
The first one gives 1 as a zero. The other two zeros
are found by the quadratic formula.
They are 3±2i
Edwin